Stephanos 131 was the hegoumenos of an unnamed monastery; mentioned in a letter of Theodoros 15 (Theodore the Stoudite) written between 809 and 811; with a hundred and ten followers, including a bishop, he refused to recognise the Moechian Synod of 809, and with fifty disciples he left his monastery (Στέφανος ὁ ἐνάρετος ἡγούμενος σὺν πεντήκοντα μαθηταῖς μετανάστης ἐκ τοῦ οἰκείου φροντιστηρίου, σὺν ἑκατόν τε δέκα, ἅμα ἐπισκόπῳ πρότερον, ἀναθεματικὼς τὴν μοιχοσύνοδον ὡς τὸ εὐαγγέλιον λύσασαν: p. 131, lines 45-48); he had written to Theodoros describing what had occurred: Theod. Stud., Ep. 48, pp. 129-139.

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